Three state polarization detection method for eliminating linear birefringence influence of optical current transformer
A current transformer, linear birefringence technology, applied in the direction of measuring current/voltage, instruments, measuring devices, etc., can solve problems such as linear birefringence that cannot be ruled out
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[0024] The present invention is described in more detail below in conjunction with accompanying drawing example:
[0025] The experimental light source adopts LED3S403 SLD of Wuhan Telecom, with a center wavelength of 1290nm; the sensor head is made of ZF-7 glass, and the reflective surface is coated with a single layer of polarization-maintaining dielectric film; the PMS-2 optical power meter is used to measure the intensity of the polarized light; tor output 1KA. Local electric heating is used for the optical sensing head to achieve temperature control. The temperature of the sensor head is at six values from 24.2°C to 42.6°C, and the system is built according to the optical path shown in Figure 2. The 45° polarized light emitted by the light source E in Injected into the sensing head of the sensor, after three reflections, it is divided into four sensing arms, and after a circle around the sensing head, the output light E out After passing through the non-polarization e...
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